Is this converter free?

Yes, WebConverter is completely free to use. There are no hidden fees, no subscription plans, and no limits on the number of files you can convert.

Do my files get uploaded to a server?

No. All conversions happen entirely in your browser using WebAssembly. Your files never leave your device, ensuring complete privacy and security.

What formats are supported?

This converter supports the following formats: MP4, WebM, AVI, MOV, MKV.

Can I use this offline?

Yes! WebConverter works as a Progressive Web App. Once installed, you can convert files without an internet connection.

Are there file size limits?

No, there are no artificial file size limits. The only limit is your device's available memory and processing power.

裁剪MP4视频

裁剪MP4视频文件 — 无需重新编码，即时结果。

Trim any MP4 video instantly without re-encoding. Drop your MP4 file, set start and end points with the visual timeline, and download the trimmed clip. Stream copy preserves full quality. Runs entirely in your browser — no upload needed.

MP4WebMAVIMOVMKVFLVOGVMPEG3GPM4VWMVTS

正在加载视频裁剪器…

您已节省约 0 千克 CO₂ （与其他在线转换工具相比）
无数据传输 — 一切都在您的设备上完成！

关于MP4裁剪

MP4是使用最广泛的视频格式。此工具使用FFmpeg WebAssembly的流复制裁剪MP4，保持100%的原始质量。

功能

近零CO₂

典型的服务器转换器消耗网络能源用于上传、数据中心电力用于处理、再次消耗网络用于下载。WebConverter仅使用您设备的CPU — 无数据传输，无服务器足迹。

安装以离线使用

WebConverter是一款渐进式Web应用。在移动设备上点击"添加到主屏幕"，或在桌面地址栏点击"安装"。安装后完全离线运行 — 适合飞机上、偏远地区或网络中断时使用。